the nervous system

Question 1

central nervous system

Answer 1

brain and spinal chord

Question 2

peripheral nervous system

Answer 2

nerves that carry messages between CNS and rest of the body

Question 3

neuron

Answer 3

nerve cell

Question 4

sensory neuron

Answer 4

takes message from the sense organ to the CNS

Question 5

motor neuron

Answer 5

takes message from CNS to muscle or gland

Question 6

ganglion

Answer 6

group of cell bodies located outside the CNS

Question 7

interneuron

Answer 7

carries information between motor and sensory neurons

Question 8

threshold

Answer 8

minimum stimulus needed for an impulse to be carried in a neuron

Question 9

all or nothing law

Answer 9

if a threshold is reached an impulse is carried but if the threshold is not reached no impusle is carried

Question 10

refractory period

Answer 10

short span after neuron has carried the impulse during which stimulus fails to cause a response

Question 11

synapse

Answer 11

region where two neutrons come into close contact

Question 12

synaptic cleft

Answer 12

the tiny gap between two neuron’s at the synapse

Question 13

reflex action

Answer 13

automatic involuntary response to a stimulus

Question 14

reflex arc

Answer 14

the pathway taken by a nerve impulse in a reflex action